Changing Background

Hello,

At the moment I am designing a website layout in photoshop. Basically what I am asking is how I would go about in the most efficient way having the background change on each different page.

I’ve included a rough example. I have created the rollovers and will go through all that in ImageReady.

I will most likely be doing the website in Dreamweaver. I am learning flash.

If there is a way to do it in flash, I welcome all suggestions!

Thank you!